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+1 vote
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in P - block elements by (63.7k points)

Give reasons for the following :

  1. Nitric oxide turns brown in air. 
  2. Copper dissolves in HNO3 but not in HCl. 
  3. Pb(NO3)2 on heating produces a pale yellow gas which on strong heating produces brown gas.

1 Answer

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Best answer

(1) 2NO + O2 → 2NO2 (Brown) 

(2) Copper is placed below hydrogen in electrochemical series and does not liberate H2 from acid. However, HNO3 oxidises copper due to its strong oxidant nature. 

3Cu + 8HNO3(dil.)  3Cu(NO3)2 + 4H2O + 2NO 

(3)Pb(NO3)2 + Δ N2O4 + Δ → NO↑ (Brown)

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